Carburetors



A. SEPPANEN CARBURETORS Nov. 1, 1966 Filed Aug. 2. 1965 INVENTOR AHTO SEPPANEN HIS ATTORNEY United States Patent 3,282,033 CARBURETORS Ahto Seppanen, 36 Hullmar Drive, Downsview, Ontario, Canada Filed Aug. 2, 1965, Ser. No. 476,317

7 Claims. (Cl. 55234) The present invention relates to a novel carburetor, a particular object and advantage thereof being to provide a device of the character herein described which is suitable to all internal combustion engines such as, besides and in addition to automobile engines, engines such as those employed to operate mowers, chain saws, snow plows and the like, and which can process such fuels as kerosene, turpentine, rubbing alcohol and the like, to give satisfactory performance of the associated engine.

A further object of the present invention is to provide a carburetor of extremely simplified and inexpensive construction both from a fabrication and from an assembly point of view so that it may retail at a conspicuously reasonable price, and which, in virtue of its particular ability to clean and remove impurities from a wide varity of inferior fuels, has the added virtue of reducing air pollution.

A further object of the present invention flowing from the last foregoing, is that the same may be employed to advantage in association with oil burners, in which function it operates to reduce and burn up all the smoke customarily liberated, and generate a highly flammable mixture.

With the foregoing objects in view, and all those objects, purposes or advantages which may become apparent from consideration of this disclosure and specification, the present invention consists of the inventive concept embodied in the method, process, construction, arrangement of parts, or new use of the same, as herein particularly exemplified in one or more specific embodiments of such concept, reference being had to the accompanying figures in which:

FIGURE 1 is a predominantly central vertical crosssection of the presently invented carburetor.

FIGURE 2 is a perspective representation of the variable air intake valve associated with the secondary air filter and secondary conduit to be described.

In the drawings, like characters of reference designate similar parts in the several figures,

The present carburetor comprises a main casing generally designated 10 and preferably of vertically cylindrical configuration enclosing a chamber 11. This chamber may if desired have a removable base plate 12 secured sealably in place by means of the several screwthreaded rods 13 the upper ends of which pass through projecting lugs 14. These lugs are formed as part of the upper casting 15 which is also separate from the body 10 as clearly depicted.

The upper casting 15 is of course also of generally an-- nular configuration, and includes the horizontally disposed elbow portion 16 which terminates in a substantially vertically discharge aperture 17.' At this point is should be explained that the body It) and casting 15 together with elbow 16 and aperture 17 may all generally be considered to comprise the chamber 11.

Extending vertically and centrally through the chamber 11 is a stand pipe 18 the lower end 19 of which is spaced from the floor 20' of chamber 11.

A lower horizontal supporting screen 20 of annular configuration spans chamber 11 between the lower the lower end 19 of stand pipe18 and the surrounding body 10. A substantially similar upper horizontal screen 21 is located within chamber 11 slightly below aperture 17.

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' Occupying the space between the two screens and surrounding stand pipe 18 is a mass fiberglass 22 or like material.

A fuel intake 23 may be located upon the wall of the body 10 at any convenient location such as where indicated, fuel in general being adapted to fill the chamber 11 and the stand pipe 18 to approximately the level 24 indicated.

At the upper end of stand pipe 18 externally of body 10 is a primary air filter 25 preferably of horizontally disposed, shallow cylindrical configuration provided with a solid surrounding wall 26 and a similar underwall 27, but a fioraminous upper wall 28 through which air may enter and pass down the stand pipe 18 to mix with the fuel within chamber 11 and pass upwardly as indicated by arrows 29 through the fuel in the fiberglass mass and upwardly through annular screen 21.

Communicating with chamber 11 and connected to aperture 17 is a primary conduit 39 containing a mixture control valve 31. Surrounding this primary conduit and upon the engine side of the valve 31 is a secondary air filter 32 which is in the form of a vertically disposed, shallow cylindrical vessel the surrounding wall 33 of which is imperforate while one end Wall (or one of the pairs of opposite walls) 34, is foraminous.

Co-axial with primary conduit 30 is a secondary conduit 35 containing the throttle valve 36. One end 37 of secondary conduit 35 abuts the end wall 38 of secondary filter 32. The annular space between the primary conduit 30 and the secondary conduit 35 is occupied by a variable air intake valve 39 illustrated in the accompanying FIGURE 2 from which the same will be seen to comprise a stationary plate 40 fixed to the wall 38and provided with a plurality of sectorial apertures 41, and a similar but rotatable plate 42 in interfacial relationship with plate 40 and provided with the sectorial apertures 43 capable of registration and mis-registration with apertures 41. A lever 44 is provided for conveniently rotating plate 42.

By suitable manipulation of the gas and air mixture control valve 31, the valve 39, and the valve 36, according to the characteristics of the fuel and those of the associated engine, elficient and economical operation may be achieved. The primary and secondary filters 26 and 32 contain conventional filtering material therein.

Since various modifications can be made to the invention herein described within the scope of the inventive concept disclosed, it is not intended that protection of the said invention should be interpreted as restriced to the modification or modifications or known parts of such concept as particularly described, defined or exemplified, since this disclosure is intended to explain the construction and operation of such concept and is not for the purpose of limiting protection to any specific embodiment or details thereof.

What I claim as my invention is:

1. A carburetor comprising in combination a primary fuel receiving chamber connected to a supply source, -a stand pipe extending vertically through said chamber to project beyond the upper end thereof, the lower end of said stand pipe opening into said chamber and occupying a horizontal plane spaced from the fioor of said chamber, a lower horizontal supporting screen surrounding said lower stand pipe end and spanning said chamber, said chamber having a substantially vertically disposed discharge aperture in the vicinity of the upper end thereof, a substantially horizontal, primary conduit commuicaing with said aperture, a mixture control valve in said conduit, a primary air filter communicating with said stand pipe externally of said chamber, a secondary conduit communicating with said primary conduit, a secondary air filter communicating with said secondary conduit, a variable air intake valve at the locus of communication between said primary and secondary conduits, a throttle valve in said secondary conduit, an upper horizontal screen surrounding said stand pipe slightly below said discharge aperture, the space within said chamber surrounding said stand pipe and between said upper and lower screens 'being occupied by fibreglass or the like substance.

2. The carburetor according to claim 1 in which said chamber is vertically cylindrical, and in which said stand pipe is cylindrical and disposed centrally with respect to the chamber.

3. The carburetor according to claim 2 in which said primary air filter is secured centrally to the upper end of said stand pipe, said primary air filter being of shallow cyclindrical configuration having closed surrounding and lower end walls, and a'forminous upper wall.

4. The carburetor according to claim 1 in which said secondary air filter surrounds said primary conduit, said primary conduit, said secondary filter being of shallow cylindrical configuration, said secondary conduit being of greater diameter than said prirnary conduit and co-axial therewith, said secondary conduit communicating with said secondary air filter.

5. The carburetor according to claim 4 in which said control valve is situated between said aperture and said secondary air filter, and said throttle valve is on the engine side of said secondary filter.

6. The carburetor according to claim 4 in which said primary conduit extends through said secondary air filter and into said secondary conduit, one end of said secondary conduit abutting one of the two opposite end walls of said secondary filter, said variable air intake valve being in the form of a pair of multi-apertured, interfacial, annular plates, one of which is fixed and the other rotatable, occupying the annular space between the wall of said primary conduit which extends as aforesaid, and the perimeter of said secondary conduit.

7. The secondary filter according to claim 6 in which the said end wall against which said secondary conduit abuts, is of greater diameter than said secondary conduit, the annular portion thereof external to said secondary conduit being imperforate, the wall of said secondary filter opposite thereto being forminous.

References Cited by the Examiner UNITED STATES PATENTS HARRY B. THORNTON, Primary Examiner.

RONALD R. WEAVER, Examiner.

5/1959 Italy. 

1. A CARBURETOR COMPRISING IN COMBINATION A PRIMARY FUEL RECEIVING CHAMBER CONNECTED TO A SUPPLY SOURCE, A STAND PIPE EXTENDING VERTICALLY THROUGH SAID CHAMBER TO PROJECT BEYOND THE UPPER END THEROF, THE LOWER END OF SAID STAND PIPE OPENING INTO SAID CHANBER AND OCCUPY ING A HORIZONTAL PLANE SPACED FROM THE FLOOR OF SAID CHAMBER, A LOWER HORIZONTAL SUPPORTING SCREEN SURROUNDING SAID LOWER STAND PIPE END AND SPANNING SAID CHAMBER, SAID CHAMBER HAVING A SUBSTANTIALLY VERTICALLY DISPOSED DISCHARGE APERTURE IN THE VICINITY OF THE UPPER END THEREOF, A SUBSTANTIALLY HORIZONTAL, PRIMARY CONDUIT COMMUICAING WITH SAID APERTURE, A MIXTURE CONTROL VALVE IN SAID CONDUIT, A PRIMARY AIR FILTER COMMUNICATING WITH SAID STAND PIPE EXTERNALLY OF SAID CHAMBER, A SECONDARY CONDUIT COMMUNICATING WITH SAID PRIMARY CONDUIT, A SECONDARY AIR FILTER COMMUNICATING WITH SAID SECONDARY CONDUIT, A VARIABLE AIR INTAKE VALVE AT THE LOCUS OF COMMUNICATION BETWEEN SAID PRIMARY AND SECONDARY CONDUITS, A THROTTLE VALVE IN SAID SECONDARY CONDUIT, AN UPPER HORIZONTAL SCREEN SURROUNDING SAID STAND PIPE SLIGHTLY BELOW SAID DISCHARGE APERTURE, THE SPACE WITHIN SAID CHAMBER SURROUNDING SAID STAND PIPE AND BETWEEN SAID UPPER AND LOWER SCREENS BEING OCCUPIED BY FIBERGLASS OR THE LIKE SUBSTANCE. 